Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第15卷    第8期    总第77期    2005年8月

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文章编号:1004-0609(2005)08-1267-05
纳米晶La1-xSrxMnO3的溶胶-凝胶法合成及表征
尹荔松1, 2, 樊志良1, 王 达1, 张进修2

(1. 中南大学 物理科学与技术学院, 长沙 410075;
2. 中山大学 光电材料与技术国家重点实验室, 广州 510275
)

摘 要:  采用溶胶-凝胶法制备了纳米晶La1-xSrxMnO3, 运用场发射扫描电镜(FESEM)、 X射线衍射分析仪(XRD)和红外光谱分析仪(FTIR)等手段对掺杂样品的微结构、 形貌等进行了分析。 结果表明: 当掺杂浓度x为0~0.5时, 所制备的粉体为单一钙钛矿相; 不同的掺杂浓度和热处理温度会使样品的晶格参数发生显著变化;La1-xSrxMnO3纳米晶粒子尺寸为10~80 nm; 掺杂浓度和热处理条件对样品粒子尺寸产生很大的影响, 在相同的热处理条件下,掺杂浓度高的样品晶粒尺寸较小, 且掺杂浓度的增大会引起晶粒特征红外振动的红移和宽化现象。

 

关键词:  纳米晶; 溶胶-凝胶; 钙钛矿; 晶格参数

Preparation and characteristics of nanocrystalline La1-xSrxMnO3 derived by sol-gel process
YIN Li-song1, 2, FAN Zhi-liang1, WANG Da1, ZHANG Jin-xiu2

1. School of Physics Science and Technology,
Central South University, Changsha 410075, China;
2. State Key Laboratory of Optoelectronic Materials and
Technology, Zhongshan University, Guangzhou 510275, China

Abstract: Nanocrystalline La1-xSrxMnO3 powders were prepared by sol-gel process. The structure and particle-size of the powders were controlled by adjusting the annealing temperature. The morphologies and microstructures of the powders were analyzed by field emission scanning electron microcopy (FESEM), X-ray diffractometry(XRD) and Fourier-transformed infrared spectroscopy(FTIR). The results show that La1-xSrxMnO3 is single perovskite structure if doped concentration x is 0-0.5. The crystal lattice parameters of the sample are changed obviously with the change of doped concentration and annealing temperature. The particle-size of the powders is 10-80 nm and influenced greatly by the doped concentration.At the same annealing temperature, the higher doped concentration is, the smaller particle-size of the powders is. The concentration increase of doped ion will make the characteristic infrared absorb peaks to shift to higher warenumber and broader frequencies.

 

Key words: nanocrystalline; sol-gel; perovskite; crystal lattice parameters

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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